Oxidation behaviour of Fe-Ni alloy nanoparticles synthesized by thermal plasma route

Ghodke, Neha P.; Kamble, Shalaka A.; Raut, Suyog A.; Puranik, Shridhar; Bhoraskar, S. V.; Rayaprol, Sudhindra; Mathe, V. L.

doi:10.1063/1.5028739

Cited by 3 publications

(3 citation statements)

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“…Due to both, the low signal in the spectra of Ni and Fe and the electron free path depth (< 10 nm), the assignation of peak contributions was not easy but it was concluded that Ni and Fe were probably partially oxidized at the Py NWs surface (NiO, Ni(OH) 2 and Fe x O y species). This is probably due to the synthesis or exposure to ambient air although XRD data have not shown signature of Ni–Fe oxide phase formation due to the low quantity in the sample 43 . In the O1s spectra from Fig.…”

Section: Resultsmentioning

confidence: 95%

“…5 b). These bands were positioned in approximately 445 and 613 cm −1 , and have been associated to the Ni–O and Fe–O, respectively 43 , 44 . This result suggests a certain degree of oxidation of the NWs in the sample as it was previously reported 43 , 44 .…”

Section: Resultsmentioning

confidence: 98%

“…These bands were positioned in approximately 445 www.nature.com/scientificreports/ and 613 cm −1 , and have been associated to the Ni-O and Fe-O, respectively 43,44 . This result suggests a certain degree of oxidation of the NWs in the sample as it was previously reported 43,44 . X-ray photoelectron spectroscopy (XPS) measurements gives information about the surface chemical composition of the Py NWs/GO composite and Py NWs samples.…”

Section: Resultsmentioning

confidence: 99%

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Permalloy nanowires/graphene oxide composite with enhanced conductive properties

Jaimes

Márquez

Ovalle

et al. 2020

Sci Rep

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carbon-metal-based composites arise as advanced materials in the frontiers with nanotechnology, since the properties inherent to each component are multiplexed into a new material with potential applications. in this work, a novel composite consisting of randomly oriented permalloy nanowires (py nWs) intercalated among the sheets of multi-layered graphene oxide (Go) was performed. py nWs were synthesized by electrodeposition inside mesoporous alumina templates, while Go sheets were separated by means of sonication. Sequential deposition steps of Py NWs and GO flakes allowed to reach a reproducible and stable graphene oxide-based magnetic assembly. Microscopic and spectroscopic results indicate that py nWs are anchored on the surface as well as around the edges of the multi-layered Go, promoted by the presence of chemical groups, while magnetic characterization affords additional support to our hypothesis regarding the parallel orientation of the Py NWs with respect to the GO film, and also hints the parallel stacking of GO sheets with respect to the substrate. the most striking result remains on the electrochemical performance achieved by the composite that evidences an enhanced conductive behaviour compared to a standard electrode. Such effect provides an approach to the development of permalloy nanowires/graphene oxide-based electrodes as attractive candidates for molecular sensing devices. Composite materials arise as versatile candidates that could be designed to satisfy diverse technological applications due to their multifunctional behaviour. Since composites are obtained by combining two or more materials that have different attributes, such assembly provides to the composite of unique properties. In fact, several examples exist that have demonstrated the industrial development behind their production, being the concrete a well-known composite, where its strength under compression is improved by adding metal rods, wires, mesh or cables in order to create reinforced concrete. Most of the current composites have been made by carbon allotropes 1, 2. In particular, when graphene is combined with the metallic copper, a new material around 500 times stronger than copper is achieved 3. Likewise, composites constituted by graphene and nickel yield a strength larger than 180 times of nickel 4. A soft Ni-rich ferromagnet 5, 6 , that is widely employed as a magnetic core material in diverse technological applications, such as magnetic recording heads 7-9 , microinductors and magnetoresistive random access memories (MRAM) 10, 11 , is the so called permalloy (Py), an alloy with about 20% iron and 80% nickel content. On the one hand, bulk Py exhibits large magnetic permeability, enhanced sensitivity in sensing devices 12 , as well as low coercivity and remanence, of interest in magnetic shielding 13. In addition, it is a material with nearly zero magnetostriction, an attribute that promotes an easier integration in different devices 13. Besides, the high Ni content provides an excellent corrosion resistance to the alloy...

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Section: Resultsmentioning

confidence: 95%